1276801

Appears in sequences

• Numerators of continued fraction convergents to sqrt(399).at n=7A041758
• a(n) = ChebyshevT(4, n).at n=20A144130
• a(n) = 2048*n^2 - 128*n + 1.at n=24A157448
• a(n) = 5000*n^2 - 200*n + 1.at n=15A157516
• a(n) = 80000*n^2 - 800*n + 1.at n=3A157661
• a(n) = value of Chebyshev T-polynomial T_n(20).at n=4A322890
• a(n) = n! * Sum_{k=0..floor(n/4)} (-n)^k / (k! * (n-4*k)!).at n=8A362322